Biography big bang theory

Cast Biographies

Cast History

Since its premiere in 2007, The Big Bang Theory has starred Johnny Galecki as Leonard Hofstadter, Jim Parsons as Sheldon Cooper, Kaley Cuoco as Penny, Simon Helberg as Howard Wolowitz and Kunal Nayyar as Raj Koothrappali.

Melissa Rauch and Mayim Bialik, who first appeared in Season 3 as Bernadette Rostenkowski and Amy Farrah Fowler, respectively, were promoted to series regulars during The Big Bang Theory's fourth season and remain members of the cast to this day.

Kevin Sussman, who appeared frequently as Stuart Bloom during Seasons 2 - 5, was promoted to a semi-regular cast member during the show's sixth, eighth and ninth seasons.

Laura Spencer, who plays Raj's girlfriend Emily Sweeney, was promoted to a semi-regular during the ninth season.

Sara Gilbert, who had a recurring role as Leslie Winkle in Season 1, joined the cast for the second season.

Sara Gilbert made her first appearance since the show's third season in the 200th episode, "